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Consolidated Statements of Comprehensive Income (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Comprehensive Income [Abstract]      
Net Income $ 2,100us-gaap_NetIncomeLoss $ 2,345us-gaap_NetIncomeLoss $ 1,545us-gaap_NetIncomeLoss
Other Comprehensive Income (Loss), Net of Tax      
Change in Unrealized Appreciation of Investments 528us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax (788)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 275us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Change in Unrealized Other-Than-Temporary Impairment Losses on Investments     2cb_ChangeInUnrealizedOtherThanTemporaryImpairmentLossesOnInvestments
Change in Postretirement Benefit Costs Not Yet Recognized in Net Income (336)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 464us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax (30)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Foreign Currency Translation Losses (117)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (72)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (11)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Total Other Comprehensive Income (Loss) Net of Tax 75us-gaap_OtherComprehensiveIncomeLossNetOfTax (396)us-gaap_OtherComprehensiveIncomeLossNetOfTax 236us-gaap_OtherComprehensiveIncomeLossNetOfTax
COMPREHENSIVE INCOME $ 2,175us-gaap_ComprehensiveIncomeNetOfTax $ 1,949us-gaap_ComprehensiveIncomeNetOfTax $ 1,781us-gaap_ComprehensiveIncomeNetOfTax